Internal-combustion engine.



R. B. OTIS.

INTERNAL COMBUSTION ENGINE.

APPLI 0ATION FILED JUNE 5, 1909.

1,000,192, Patented Au .8,191 1.

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R. B. 0121s. INTERNAL COMBUSTION ENGINE.

APPLICATION FILED JUNE 5, 1909.

Patented Aug. 8, 1911.

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R, 1a.v 0171s. INTERNAL COMBUSTION ENGINE, APPLICATION FILED JUNE 5, 1909..

7 1 000; 1 92 Patented Aug. 8, 1911.

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APPLICATION I'ILED JUNE 5, 1909.

Patented Aug. 8, 19 11.

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INTERNAL-.UOMBUSTWN v ENGINE.

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Specification oi Letters Patent. Patentfi Aug, 8, 1911, Application filed June 5, 1909. Serial Eo. 590,38.

To all whom it may concern:

Be it known that I, ROBERT B. QTIS, a citizen of the United States, residlng' at Golden, county of Jefferson, State of -Colo rado, have invented a certain new and useful Improvement in Internal- Combustion Engines, and declare the In the accompanying drawings,Figu e1 is a. side elevation of a two-cylinderengine elevation of the same. Fig. 3 is a central section. Fig. 4 is a plan' .view, parts being broken away to economizefroom. Fig. 5 is. a section in the pl'ane'ind'icated by the line 5 5 Fig. 3. Fig. disasection in the indicated by the line 6-6 Fig. 3.

- A, A are the working cylinders.

B, B are cylinders ofgreaterdiameter than the cylinders A, A ,'a .xially-in line with the latter and forming an enl'arged extension thereof. v I Q C is the main shaft of the engine. D, D are cranks setopposite each other on tle shaft C. j

E, l are connecting rods pivoted at their lower ends to the cranks D, D and attheir upper ends totrunk pistons F, F adapted to reciprocate in the cylinders A, A

G, G are pistons fitting respectively and adapted to reciprocate in the cylinders 13,13 The pistons G, G are integral with and form enlargements respectively of the pistons F, F. The pistons G, G form annular pump chambers g, g above them inlthe cyl inders B, B surrounding the istons F, F

H, H are the exhaust ports t rough which the products of combustion are discharged from the cylinders A, A. I

h is a chamber between the cylinders A, A with which chamber the exhaust ports H, H communicate. H is a pipe through of combustion chamber h. 5 k 72, are plates bolted onto the cylinders which the products. are discharged. from the following when full, clear, and exact description: of the same, 1 such as will enableothers embodying my invention. Fig. 2 is an end A, A and forming, when secured in mclosingwalls to the chamber k.

I, J are valves located at the top of the cylinders A, A open inward.

K, K valves I, J.

b, 6 indicate upward extensions of the annular pump chambers g, and g L, L are 'pipes for conveying a charge of explosive mixture from an annular pump chamber 9 to the valve casing K or from the annular pump chamber tothe'valve casing K. These pipes communicate"respectively with the extensions 6, b from said an- .nular pump chambers. The casing K is provided with an apertu e at one side-fend with a flat machined bearing surface surrounding said aperture; the casing K is constructed like K except that chinedsurface is uponflthe other side. ,The. extensions 5 sides of the engine and laterally beyond the position of the plates it, if, andfthere is a lateral opening leading from each of said extensions surrounded by a fiat ing surface.

place,

The pipes L, L are provided with flanges at their ends adapted to fit and be secured against the fiat machinedbearing surfaces at the sides of the casings K and K and such surfaces surrounding the latrespectively. and adapted to U '60 are valve casings inclosing the the aperture and mar machined beareral openings leading from the extensions 6, J

b and such pipes are bowed so as to extend over the platesh h M, M (Fig. 6) are intake ports adapted. to draw their charge through an inlet pipe .M which may communicate with a carbureter, ,so as to supply an explosive mixture.

m, m are ports by which a charge of explosive mixture is drawn into the annular chamber 9, or g, on'the down stroke ofthe piston G or G The operation of the above described device is asfollows:-When scends, an explosive mixture is drawn into the annular let port M. Meanwhile the ture in the cylinder A above the piston F Said compressed ex; ploslve mixture is now fired,'its expansion driving the piston F rises compressing the explosive mixture iii the pumpchamber 9 above it and forcing.

said mixture into the pipe L and valve case the piston G de- 10opump chamber 9 through the in- I explosive mixis being compressed and filling the cylinder A above the piston F and displacing the products of combustion through the exhaust port/H During this operation, a charge of explosive mixture has been taken into the annular chamber 9 and when the piston F has'nearlycompleted its compression stroke, said. mixturehasbeen forced into the pipe L and valve case 'K, and

when the piston Funcovers the exhaust port H and the products ofcombustion, have been discharged into the chamber 7L, said explosive mixture rushes into the cylinderA above the piston F, filling its explosion chamber and displacing a further quantity of the products of combustion. During the return stroke, the charge is compressed in the cylinder A above the piston F, as-above described with reference to the cylinder A and at the upper end of the stroke of the piston F, the compressed charge is fixed and forces the piston F downward on its working stroke. I k y The constrj ction by which the two cylinders exhaust into an intermediate chamber closed in by plates 71 h, and by which the flanged pipesL, L pass over said plates upon opposite sides'of theengine and are conveniently secured in place upon the flat machined bearing surfaces by corresponding flat flanges at their ends, forms a convenient and symmetrical construction, which may be easily and conveniently put together and in which the joints are accessible and easily made tight.

1 In an internal combustion en 'ne, two cylinders arranged side by side, eac of said [cylinders having a larger and a smaller part axially in line with each other, a piston fitting and adaptedto reciprocate" in the smaller part of each of saidcylinders and extending into the larger part thereofleach of said pistons being provided with an enlargement forming a piston in said larger part, and an annular pump chamber above said enlargement, :the smaller parts of said cylinders being provided with exhaust ports open from adjacent sides thereof, said cylinders being provided with an intermediate exh aust chamber, said exhaust ports opening into said chamber, said cylinders being pro vided with valve cases K, "K on their smaller parts one of said valve cases having an openmg upon one s1de and the other of said valve cases an openingiipon the side opposite to the opening in the other of said valve cases, bearing surfaces surrounding said openings, lateral openings .from said annular fpump chambers the opening from one o said pumps being upon one side of the engine and that from the other of said ptlmps upon the other side, and located to the side of said exhaust chamber, bearing surfacesaround said openings, and pipes provided with flanges at their ends, fitted against said bearing surfaces and extending across said exhaust chamber at opposite sides of the cylinders, said pipes connecting the pump chamber of each cylinder with the valve case of the other cylinden I 2. In an internal combustion engine, two

cylinders-arranged side by side, each of said cylinders having a larger and a smaller part axially in line with each other, apiston fitting and adapted to reciprocate in the smaller part of each of said cylinders and extending into the large part thereof, each of said pistons being provided with an enlargement forming a piston in said larger part, and an annular pump chamber above said enlargement, the smaller parts of said cylinders being provided with exhaust ports open .from' adjacent sides thereof,'said cylinders being I provided with an intermediate exhaust chamber, said exhaust ports ope g into said chamber, said cylinders being valve cases K, K on their sma of said valve cases having ano ening upon iiii'ovided with 1 er parts, one

, one side and the other of said valve cases an.

opening uptfii the side opposite to -theopen ing in the other of said valve'cases, bearing surfaces surrounding said open1ngs,\upward extensions to said annular chambers one of engine and the other of said extensions upon the other side of said engine and located to.

the side of said exhaust chamber, said upward extensions being provided with openings,bearing surfaces around said openings,

and pipes L, L provided with. flanges at their ends fitted against said bearing surfaces and extending across said exhaust chamberat opposite sides of the cylinders. said pipes connecting the pump chamber of each cylinder with the valve case of the a said extensions being upon one side of said Copies or this patent be mm 2dr five as. men, by'aaar ssin -m Commissioner 01' menu; 

